软件工程概论第一课

一.网站系统开发需要掌握的技术

1.javaweb

2.HTML

3.CSS

二.课堂测试的源代码

package com.jaovo.msg.dao;


import com.jaovo.msg.model.User;

public interface IUserDao {
    
    public void login(User user);
    public void register(User user);
    
    
}

package com.jaovo.msg.dao;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;


import com.jaovo.msg.Util.DBUtil;
import com.jaovo.msg.Util.UserException;
import com.jaovo.msg.model.User;



public class UserDaoImpl implements IUserDao {

    public void login(User user) {
        
        Connection connection = DBUtil.getConnection();
        String sql = "select count(*) from t_login where username=? And password = ?";
        PreparedStatement preparedStatement = null;
        ResultSet resultSet = null;
        
        try {
            preparedStatement = connection.prepareStatement(sql);
            preparedStatement.setString(1, user.getUsername());
            preparedStatement.setString(2, user.getPassword());
            System.out.println("当前的文本框中的姓名为:"+user.getUsername());
            System.out.println("当前的文本框中的密码为:"+user.getPassword());
            resultSet = preparedStatement.executeQuery();
            
            while(resultSet.next()) {
                
                if (resultSet.getInt(1) > 0) 
                {
                    return;
                }
                else
                {
                    throw new UserException("用户不存在!") ;
                }
                
                
            }
            
            
            
        } catch (SQLException e) {
            e.printStackTrace();
        }finally {
            DBUtil.close(resultSet);
            DBUtil.close(preparedStatement);
            DBUtil.close(connection);
        }
        
    }

    public void register(User user) {
        Connection connection = DBUtil.getConnection();
        String sql = "select count(*) from t_login where username = ?";
        PreparedStatement preparedStatement = null;
        ResultSet resultSet = null;
        
        try {
            preparedStatement = connection.prepareStatement(sql);
            preparedStatement.setString(1, user.getUsername());
            resultSet = preparedStatement.executeQuery();
            
            
            while(resultSet.next()) {
                
                if (resultSet.getInt(1) > 0) 
                {
                    throw new UserException("用户已存在!") ;
                }
                
            }
            
            sql = "insert into t_login(username,password) values(?,?)";
            preparedStatement = connection.prepareStatement(sql);
            
            preparedStatement.setString(1,user.getUsername());
            preparedStatement.setString(2,user.getPassword());
            
            preparedStatement.executeUpdate();
            
        } catch (SQLException e) {
            e.printStackTrace();
        }finally {
            DBUtil.close(resultSet);
            DBUtil.close(preparedStatement);
            DBUtil.close(connection);
        }
        
    }



}

package com.jaovo.msg.model;

public class User {
    
    private int id;
    private String  username;
    private String  password;
    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }
    public String getUsername() {
        return username;
    }
    public void setUsername(String username) {
        this.username = username;
    }
    
    public String getPassword() {
        return password;
    }
    public void setPassword(String password) {
        this.password = password;
    }
    
}

package com.jaovo.msg.Util;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

public class DBUtil {
    
    public  static  Connection getConnection() {
        try {
            
            Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver").newInstance();
            
        } catch (InstantiationException | IllegalAccessException | ClassNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        String user = "sa";
        String password = "jisuan@10Q";
        String url = "jdbc:sqlserver://localhost:1433;DatabaseName=hoghouse";
        Connection connection = null;
        try {
            connection = DriverManager.getConnection(url,user,password);
            
        } catch (SQLException e) {
            
            e.printStackTrace();
        }
        return connection;
    }
    
    
    public static void close(Connection connection ) {
        try {
            if (connection != null) {
                connection.close();
            }
            
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
    public static void close(PreparedStatement preparedStatement ) {
        try {
            if (preparedStatement != null) {
                preparedStatement.close();
            }
            
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
    public static void close(ResultSet resultSet ) {
        try {
            if (resultSet != null) {
                resultSet.close();
            }
            
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
    
}

package com.jaovo.msg.Util;

public class UserException extends RuntimeException{

    /**
     * 
     */
    private static final long serialVersionUID = 1L;

    public UserException() {
        super();
        // TODO Auto-generated constructor stub
    }


    public UserException(String message) {
        super(message);
        // TODO Auto-generated constructor stub
    }

    
}

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
    <title>用户登录页面</title>
</head>
<body>
    <%=request.getAttribute("error") %>
    <form action="back-login.jsp" method="get">
        <table align="center" border="1" width="500">
            <tr>
                <td>用户名称 : </td>
                <td>
                    <input type="text" name="username" />
                </td>
            </tr>
            <tr>
                <td>用户密码:</td>
                <td>
                    <input type="password" name="password" />
                </td>
            </tr>
            <tr align="center">
                <td colspan="2">
                    <input type="submit" value="登录" />
                </td>
                <td colspan="2">
                    <a href="front-register.jsp">注册</a>
                </td>
            </tr>
        </table>
    </form>
</body>
</html>

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
    <title>用户注册页面</title>
</head>
<body>
    <%=request.getAttribute("error") %>
    <form action="back-register.jsp" method="get">
        <table align="center" border="1" width="500">
            <tr>
                <td>用户名称 : </td>
                <td>
                    <input type="text" name="username" />
                </td>
            </tr>
            <tr>
                <td>用户密码:</td>
                <td>
                    <input type="password" name="password" />
                </td>
            </tr>
            <tr align="center">
                <td colspan="2">
                    <input type="submit" value="注册" />
                    <input type="reset" value="重置" />
                </td>
            </tr>
        </table>
    </form>
</body>
</html>

<%@page import="com.jaovo.msg.Util.UserException"%>
<%@page import="com.jaovo.msg.dao.UserDaoImpl"%>
<%@page import="com.jaovo.msg.model.User"%>
<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<%
    //接收客户端传递过来的参数
    String username = request.getParameter("username");
    String password = request.getParameter("password");
    if(username == null || "".equals(username.trim())){
        request.setAttribute("error", "用户名不能为空");
%>
    <jsp:forward page="front-login.jsp"></jsp:forward>
<%
    }
    User user = new User();
    user.setUsername(username);
    user.setPassword(password);
    
    UserDaoImpl userDao = new UserDaoImpl();
    try{
    userDao.login(user);
%>
    用户登录成功!!<br>
    <a href="#">网站界面</a>
<%
    }catch(UserException e){
%>
    <h2 style="color:red ; font-size:50px">发生错误 : <%=e.getMessage() %></h2>
    <%
    }
    %>
</html>

<%@page import="com.jaovo.msg.Util.UserException"%>
<%@page import="com.jaovo.msg.dao.UserDaoImpl"%>
<%@page import="com.jaovo.msg.model.User"%>
<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<%
    //接收客户端传递过来的参数
    String username = request.getParameter("username");
    String password = request.getParameter("password");
    if(username == null || "".equals(username.trim())){
        request.setAttribute("error", "用户名不能为空");
%>
    <jsp:forward page="front-register.jsp"></jsp:forward>
<%
    }
    User user = new User();
    user.setUsername(username);
    user.setPassword(password);
    
    UserDaoImpl userDao = new UserDaoImpl();
    try{
    userDao.register(user);
%>
    用户注册成功!!<br>
    <a href="front-login.jsp">登录</a>      
<%
    }catch(UserException e){
%>
    <h2 style="color:red ; font-size:50px">发生错误 : <%=e.getMessage() %></h2>
    <%
    }
    %>
</html>

三.运行结果截图

四.列出你对这门课的希望和自己的目标，并具体列出你计划每周花多少时间在这门课上。

目标:能够自己开发一个动态的小型网站

时间分配:周三的下午两个小时，周四两小时，周六一天